Drinking water quality · 2023
· Verified
What's in Cal American Wc - Las Posas Estates — Rosemead, Ca, CA tap water
15 contaminants were measured in the Cal American Wc - Las Posas Estates — Rosemead, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 15
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 2.3 mg/LReported levelSystem-wide | 4 mg/LMRDLG | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 3 ug/LAverage2% Surface Water Treated by Calleguas | None set | Within the limit |
+By source (2)— 2% Surface Water Treated by Calleguas, MWDSC 98% Jensen WTP
| |||
| CopperA metal that enters water from corroding household plumbing. | 0.153 mg/L90th percentileAt the tap | 1.3 mg/LPublic health goal | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 1 ug/L90th percentileAt the tap | 0.2 ug/LPublic health goal | Within the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | Not detected ug/LAverageMWDSC 98% Jensen WTP | None set | Within the limit |
+By source (2)— 2% Surface Water Treated by Calleguas, MWDSC 98% Jensen WTP
| |||
| AluminumA common element sometimes used as a treatment coagulant. | 62 ug/LAverageMWDSC 98% Jensen WTP | None set | Detected — no federal limit |
+By source (2)— MWDSC 98% Jensen WTP, 2% Surface Water Treated by Calleguas
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 15 ug/LRunning annual avgSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 7.1 ug/LRunning annual avgSystem-wide | None set | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.7 mg/LAverageMWDSC 98% Jensen WTP | 4 mg/LMCL | Within the limit |
+By source (2)— 2% Surface Water Treated by Calleguas, MWDSC 98% Jensen WTP
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.5 mg/LAverageMWDSC 98% Jensen WTP | 10 mg/LMCL | Within the limit |
+By source (2)— MWDSC 98% Jensen WTP, 2% Surface Water Treated by Calleguas
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.14 NTUReported levelSystem-wide | None set | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Highest single sampleNo. of Samples | 0Public health goal | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0Highest single sampleNo. of Samples | 0Public health goal | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 5.5 pCi/LAverage2% Surface Water Treated by Calleguas | None set | Detected — no federal limit |
+By source (2)— 2% Surface Water Treated by Calleguas, MWDSC 98% Jensen WTP
| |||
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2 pCi/LAverageMWDSC 98% Jensen WTP | 20 pCi/LMCL | Detected — no federal limit |
+By source (2)— MWDSC 98% Jensen WTP, 2% Surface Water Treated by Calleguas
| |||
People also ask about Cal American Wc - Las Posas Estates — Rosemead, Ca, CA's water
+Is Cal American Wc - Las Posas Estates — Rosemead, Ca, CA tap water safe to drink in 2023?
Every one of the 15 contaminants measured in Cal American Wc - Las Posas Estates — Rosemead, Ca, CA's 2023 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Cal American Wc - Las Posas Estates — Rosemead, Ca, CA tap water?
15 contaminants were measured in Cal American Wc - Las Posas Estates — Rosemead, Ca, CA's 2023 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 8 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Cal American Wc - Las Posas Estates — Rosemead, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Cal American Wc - Las Posas Estates — Rosemead, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.